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vxvoltune

NAME

vxdmptune, vxvoltune - display and change values of VxVM and DMP tunable parameters

SYNOPSIS

vxdmptune [-H] [dmp_parameter]

vxdmptune [-H] dmp_parameter value

vxvoltune [-H] [vxvm_parameter]

vxvoltune [-H] vxvm_parameter value

DESCRIPTION

The vxvoltune and vxdmptune utilities can be used to display and change the values of Veritas Volume Manager (VxVM) and Dynamic Multipathing (DMP) tunable parameters. If no arguments are specified, the commands display the currently defined values of all tunables that have values specified in the configuration file. If the name of a tunable parameter is specified, only its value is displayed. If a value is specified as an additional argument, this is used to update the setting in the configuration file. Any changes to this file are not applied until the system is shut down and rebooted. The changes are persistent across reboots of the system.

OPTIONS

-H

Displays detailed help on the usage of the command.

EXAMPLES

Display the current value of the vol_maxkiocount VxVM parameter:

vxvoltune vol_maxkiocount

Set the value of vol_maxkiocount to 8192:

vxvoltune vol_maxkiocount 8192

FILES

/etc/vx/vxdmp_tunables

Configuration file for DMP tunables.

/etc/vx/vxvm_tunables

Configuration file for VxVM tunables.

NOTES

The following tunables may be set using vxdmptune:

dmp_enable_restore_daemon

Configuration file for VxVM tunables.

dmp_failed_io_threshold

Configuration file for VxVM tunables.

dmp_pathshitch_blks_shift

Configuration file for VxVM tunables.

dmp_restore_daemon_cycles

Configuration file for VxVM tunables.

dmp_restore_daemon_interval

Configuration file for VxVM tunables.

dmp_restore_daemon_policy

Configuration file for VxVM tunables.

dmp_retry_count

Configuration file for VxVM tunables.

The following tunables may be set using vxvoltune:

maxiosize

Configuration file for VxVM tunables.

vol_checkpt_default

Configuration file for VxVM tunables.

vol_default_iodelay

Configuration file for VxVM tunables.

vol_fmr_logsz

Configuration file for VxVM tunables.

vol_max_nmpool_sz

Configuration file for VxVM tunables.

vol_max_rdback_sz

Configuration file for VxVM tunables.

vol_max_wrspool_sz

Configuration file for VxVM tunables.

vol_max_volumes

Configuration file for VxVM tunables.

vol_maxioctl

Configuration file for VxVM tunables.

vol_maxkiocount

Configuration file for VxVM tunables.

vol_maxparallelio

Configuration file for VxVM tunables.

vol_min_lowmem_sz

Configuration file for VxVM tunables.

vol_rvio_maxpool_sz

Configuration file for VxVM tunables.

volcvm_smartsync

Configuration file for VxVM tunables.

voldrl_max_drtregs

Configuration file for VxVM tunables.

voldrl_max_seq_dirty

Configuration file for VxVM tunables.

voldrl_min_regionsz

Configuration file for VxVM tunables.

voliomem_chunk_size

Configuration file for VxVM tunables.

voliomem_maxpool_sz

Configuration file for VxVM tunables.

voliot_errbuf_dflt

Configuration file for VxVM tunables.

voliot_iobuf_default

Configuration file for VxVM tunables.

voliot_iobuf_limit

Configuration file for VxVM tunables.

voliot_iobuf_max

Configuration file for VxVM tunables.

voliot_max_open

Configuration file for VxVM tunables.

volpagemod_max_memsz

Configuration file for VxVM tunables.

volraid_minpool_size

Configuration file for VxVM tunables.

SEE ALSO

vxintro(1M)

See the Veritas Volume Manager Administrator's Guide and Veritas Volume Replicator Administrator's Guide for a description of these tunables.